Medusa\Tree\PersistentAvlTree::removeLastAndPlaceAtTheTop PHP Метод

    private function removeLastAndPlaceAtTheTop()
    {
        for ($next = $this->right(); $next->left()->isEmpty();) {
            $next = $next->left();
        }
        return new self($next->key(), $next->value(), $this->left, $this->right->remove($next->key()));
    }